Kartomora, Simic Mistake

Glide( This creature only has flying if there's a +1/+1 counter on it)
Trample, Haste
{t} Lose 3 life, proliferate
Whenever a creature you control mutates and X mana of any color to your mana pool, and that creature gets +X/+X where X is equal to how many times that creature mutated.